archconfraternity
noun/ˌɑː(ɹ)t͡ʃˌkɒnfɹəˈtɜː(ɹ)nɪti/
Etymology From arch- + confraternity, calque of Ecclesiastical Latin archiconfrāternitās.
1
Catholicism, Christianity, Roman Catholicism A religious confraternity that, as a special concession of the Holy See, can join or affiliate with, and extend privileges to, other similar brotherhoods.